visual basic barcode program The StatsWin Constructor in Java

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The StatsWin Constructor
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StatsWin( ) must be passed a reference to the data being analyzed. It then constructs an object that performs statistical analysis on that data. Most of the code in the constructor is straightforward, but we will briefly walk through its operation. StatsWin( ) begins by saving a reference to the data. It then adds a window listener that handles window-closing events. When such an event occurs, the shutdown( ) method is called, which removes all windows opened by StatsWin. Next, StatsWin( ) creates the File menu by calling CreateMenu( ). The file menu contains only one entry: Close. When Close is selected, the application is terminated. StatsWin( ) then changes the layout manager to centering, flow layout. This is necessary because Frame uses border layout by default. Next, the size and title of the window are set and the regression data is obtained. Then, the number format that will be used to display the statistics is set to two decimal places using this line of code:
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8: Statistics, Graphing, and Java
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nf.setMaximumFractionDigits(2);
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As mentioned earlier, nf refers to a NumberFormat object. This is an object that can be used to describe the display format of numeric values. The setMaximumFractionDigits( ) method sets the maximum number of digits displayed after the decimal point. StatsWin uses nf to format all numeric output. If you want to see more decimal places, simply change the value in the call to setMaximumFractionDigits( ). The next few lines of code create a string that contains the results of the various statistics for the data:
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// Construct output. String mstr; try { // Obtain mode, if there is one. mstr = nf.format(Stats.mode(data)); } catch(NoModeException exc) { mstr = exc.toString(); } String str = "Mean: " + nf.format(Stats.mean(data)) + "\n" + "Median: " + nf.format(Stats.median(data)) + "\n" + "Mode: " + mstr + "\n" + "Standard Deviation: " + nf.format(Stats.stdDev(data)) + "\n\n" + "Regression equation: " + rd.equation + "\nCorrelation coefficient: " + nf.format(rd.cor);
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Notice how the string for the mode is obtained. Recall that mode( ) throws an exception when the sample has no mode. Thus, mstr will contain either a string containing the mode or a message signifying that no mode exists. Once the output string, str, has been fully constructed, it is then put into a TextArea object referred to by statsTA. This object is then set to read-only by calling setEditable(false). Thus, the text area displays the data, but does not allow it to be altered. The various GUI objects are then added to the window along with their component listeners. Because the text area is read-only, it does not require a listener. Finally, the window is made visible.
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The itemStateChanged( ) Handler
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Much of the action in StatsWin occurs in itemStateChanged( ). This method handles changes to the four check boxes. Each time the user checks a box, the window associated with that box is displayed. Each time the user clears a box, the window associated with that
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box is removed. To understand how this process works, we will examine the code sequence that handles changes to the Bar Graph check box. It is shown here:
if(bar.getState()) { if(bg == null) { bg = new Graphs(data, Graphs.BAR); bg.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { bar.setState(false); bg = null; } }); } } else { if(bg != null) { bg.dispose(); bg = null; } }
The state of bar, which holds a reference to the Bar Graph check box, is obtained by calling getState( ). If the return value is true, then the box is checked; otherwise it is cleared. If the box is checked and if bg is null, it means that no bar graph window is currently being displayed. In this case, bg is assigned a reference to a new Graphs object that displays the bar graph. Otherwise, if bg is not null, then a bar graph window is already being displayed and no other action takes place. If a new bar graph window is created, a window listener is added that monitors the bar graph window. This listener handles the window-closing event generated by the bar graph window. This means that a StatsWin object will receive a notification when the bar graph window is closed. When a close notification is received, the state of the Bar Graph check box is cleared and bg is set to null. If the state of bar is cleared when an item change event occurs, and if bg is not null, the window holding the bar graph is removed by calling dispose( ) and bg is set to null. This same basic mechanism is used by all four check boxes.
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